2002ApJ...569L.107N

We have obtained high-resolution spectra of the extremely metal-poor star CS 22949-037 ([Fe/H]=-3.79) in the region of the ultraviolet NH bands at 3360-3370 Å, which confirm our earlier report that it exhibits extreme nitrogen enhancement. We find [N/Fe]=2.3±0.4. The star is also known to have large relative overabundances, of order 0.5-1 dex, of carbon and the α-elements. This abundance pattern is not explained by any standard Galactic chemical enrichment model of which we are aware. The large N enhancement is, however, predicted by the zero heavy element, M≳200 M_☉, hypernova models of Woosley & Weaver and Fryer, Woosley, & Heger. If the rotating models of Fryer et al. are relevant to the enrichment of CS 22949-037, one might expect it to possess a large overabundance of oxygen, with a mass fraction similar to or larger than that of nitrogen, and an [O I] λ6300.3 line strength of ∼2-8 mÅ.